KR20080086415A - Method and apparatus for handling random access procedure in a wireless communications system - Google Patents

Abstract

A method and an apparatus for processing a random access procedure in a wireless communication system are provided to allow a UE(User Equipment) assigned a dedicated preamble to handle a random access procedure. A control circuit(106) realizes functions of a communication device(100). A CPU(108) is installed in the control circuit to execute a program code for instructing the control circuit. A memory(110) is installed in the control circuit to store the program code and connected with the CPU. The communication device is allocated the program code in a dedicated preamble for a random access procedure. When a UE fails to receive a downlink message successfully, the communication device determines whether to re-use the dedicated preamble or whether or not the random access procedure has failed.

Description

Method and apparatus for handling random access procedure in a wireless communications system

[CROSS REFERENCE TO RELATED APPLICATION]

This application is filed on 3/21/2007 and filed on US Provisional Application No. 60 / 895,987, entitled " Method and Apparatus to improve LTE Random access procedure ", and on June 25, 2007, entitled " Method and Apparatus to optimize Random Access Procedure, "US Provisional Application No. 60 / 945,948, the contents of which are incorporated herein by reference.

[Field of Invention]

The present invention relates to a method and apparatus for processing a random access procedure in a wireless communication system, and more particularly, to a method and apparatus for fulfilling timing alignment and resource request in order to increase system efficiency.

The third generation mobile telecommunications system (called 3G system) provides high frequency spectrum utilization, universal coverage, and high quality, high speed multimedia data transmission, better communication quality, and a variety of flexible two-way to reduce transmission error rate While providing transport services, it satisfies all kinds of QoS requirements simultaneously. However, due to the demand for high speed and multimedia applications, next generation mobile telecommunication technology and related communication protocols have been developed.

In Long Term Evolution wireless communication systems (LTE systems), a random access channel (RACH) is placed in an uplink (UL) channel between the user equipment (UE) and the network, and timing Used for sorting, Radio Network Temporary Identifier (RNTI) allocation, and resource requests. In the start state, only downlink (DL) timing is synchronized between the UE and Node B (NB), and the signals on the RACH may be used for UL timing alignment. Before performing UL timing alignment, the UE uses reference signals or downlink synchronization channel to perform synchronization on timing and frame. However, because the signals are delayed due to the distance between the transmitter and the receiver, the UE cannot determine whether the message sent from the UE is at the start position of the NB's receive frame. In addition, when simultaneously serving NB multiple UEs, Round Trip Delays (RTDs) between each UE and NB vary due to their different distances, resulting in a timing offset. Thus, the NB evaluates the timing offset of the UE according to the RACH signals from the UE and informs the UE to adjust the UL timing on the downlink shared channel (DL-SCH) to achieve timing synchronization. The RACH signal consists of preambles used for UL timing synchronization and UE identity detection or for carrying short sinalling or signatures.

On the other hand, RACH signals between different UEs are transmitted to the NB by a connection-based or non-connection-based method. That is, the UE may select an RACH transmission opportunity, arbitrarily select a preamble for transmitting a signal, or transmit a signal carrying a preamble allocated by the network (in this case, the RACH transmission opportunity may be selected by the network. Assigned and selected by the UE). If the network is unable to recognize the transmitted RACH signal due to collision or low power, or if contention loss occurs due to a randomly-selected preamble, a response from the network is received or, for example, maximum transmission or maximum power. The UE may then retransmit the RACH signal at greater power to the next available RACH transmission opportunity until such a condition is achieved.

For LTE, RACH transmission opportunities are related to time-frequency radio resources, not just time or frequency. Thus, when the RACH physical resource is selected, its time period and frequency band are determined. Of course, at any time period, there may be more than one frequency sub-band for selection. In contrast, the preamble may be a random access preamble randomly selected by the UE or a dedicated preamble allocated by the network (source cell or target cell). Basically, when a UE uses a random access preamble (randomly selected), it is likely that another UE will use the same preamble and send it on the same RACH opportunity, so that the network can determine whether the signal is coming from one or more UEs. do not know. As a result, a conflict exists and will be resolved after the UE sends its UE identity in message 3 that follows. In contrast, a dedicated preamble is assigned to a particular UE known by the network, so it is unique and does not lead to contention between the UEs (no other UE uses the same dedicated preamble).

In LTE, an asynchronous RACH is terminated and employed as a working assumption where both RACH accesses based on a dedicated preamble and a random access preamble are supported. Primarily in terms of latency and overhead, random access procedure performance depends on collision / combatability, time / frequency resources, number of user equipment (load), number of preamble signals, channel quality, UE identity, and even access synchronization. (even access causes). On the other hand, possible reasons for the UE to access the RACH include four major causes: initial NAS signaling for NAS procedures (e.g., service requests, network connections, routing / tracking area updates). Can be categorized into initial access (eg, UE originated call, network origin call, tracking area update, and initial cell access), while optimizing for connected state UEs, regardless of cell size. In order to be common for various kinds of asynchronous RACH access for FDD and TDD in E-UTRAN (eNB and aGW) as well, design requirements such as short life span of identity use as well as performance are considered . According to the requirements and needs of support for possible access causes, the baseline random access procedure model and channel mapping (between logical channels and mobile channels) are defined in the prior art. The current decision of the four steps of the random access procedures is shown below:

Step (1): "Random Access Preamble on RACH in Uplink": corresponds to message 1 carrying 6 bits, CQI for appropriate allocation of random ID, and UL resource, if any, Points to other information, such as, for example, cause or size, that could potentially have a rank or pathloss.

(2) step: " random access response on DL-SCH ": is a HARC (Hybrid Automatic Repeat) transmitted on L1 / L2 + DL-SCH addressed to a random access RNTI (RA-RNTI) on an L1 / L2 control channel Request) is message 1 and semi-synchronous (within flexible windows of size 1 or more TTIs) with no support, at least the RA-preamble identifier, timing alignment information, initial UL grant and It carries a Temporary Cell RNTI (T-CRNTI) and corresponds to message 2 intended for single or multiple UEs in one DL-SCH message.

(3) step "first scheduled UL transmission on UL-SCH": uses HARQ, operates in Radio Link Control Transparent Mode (RLCTM) without segmentation and at least C-RNTI is already used Corresponds to message 3 carrying (identified or implied) information as to whether it is possible and a UE identifier. In addition, in the case of initial access and if the size of the message allows, an initial NAS message (or allowing building an initial NAS message in the eNB) may be included, and the size of the message is dynamic.

(4) step “contention resolution on DL-SCH”: does not synchronize with message 3 and (at least at initial contact) does not affect message 4 addressed with Temporary C-RNTI on the L1 / L2 control channel. Corresponding. In addition, the content of the message is FFS (for further study), HARQ is supported, and HARQ feedback is provided in its own UE as provided in message 3 repeated in the Radio Resource Control (RRC) Contention Resolution message. It is sent only by the UE detecting the identity.

In the prior art, upon initial access, the four steps are: random access preamble on RACH, random access response on Common Control Channel (CCCH) on DL-SCH, RRC connection request on CCCH on UL-SCH, and DL-SCH RRC collision decision via CCCH on the network.

Thus, for LTE, the prior art provides the steps of the RA procedure. However, sometimes problems can arise.

HARQ is not supported for message 2. Thus, during a random access procedure or RACH access, if the UE with the allocation of the dedicated preamble does not successfully receive message 2, which may have already been sent by the network, the provided preamble is discarded. It is not determined when or under what conditions the preamble provided for the UE should be recovered by the network and how the provided preamble will be used efficiently. If the UE with the provided preamble fails to receive a random access response, either reuse the preamble provided for contention-less random access or if the UE is not able to It may be considered to use a random access preamble, assuming that it is released after a random access attempt. Standardized rules should be established to avoid misunderstanding the use and allocation of dedicated preambles between the UE and the network. Otherwise, the dedicated preamble may not be emitted or even increase the probability of collision.

The network may pre-assign a dedicated preamble to the UE for a synchronization request (eg, when the UE loses synchronization or there is a UE origin call) or a scheduling request. However, the dedicated preamble must be reserved and dynamically allocated to the UE only when necessary. Naturally, it is insufficient to provide non-contention based RA to a number of connected users (including UEs of long-DRX). On the other hand, in order for the dedicated preamble allocation to be efficient, if the UE consecutively requests two different random access procedures or RACH access for different reasons (eg, synchronization request and scheduling request), two If UEs are initializing a RACH access or random access procedure of the same priority, it is time / wireless resource to issue a dedicated preamble (e.g. new or old), especially while the dedicated preamble is reused / later released. Wasting them is not efficient.

In LTE RACH access, the coexistence of the dedicated preamble and the random access preamble is performed by the UE for procedures (e.g., time critical or non time critical) in which the available preambles are sufficient or simultaneous, especially for a particular environment. Should be considered when

The present invention provides a method and system for handling a random access procedure in a user equipment (hereinafter referred to as 'UE') to which a dedicated preamble for a random access procedure in a wireless communication system is assigned.

According to the claimed invention, a method for handling a random access procedure in a user equipment (hereinafter referred to as "UE") to which a dedicated preamble for a random access procedure in a wireless communication system is assigned, the method wherein the UE is downlink If the message is not successfully received or the random access procedure fails, the method includes determining whether to reuse the dedicated preamble.

According to the claimed invention, a method of handling a random access procedure in a network of a wireless communication system includes: receiving a dedicated preamble for access of a random access channel from user equipment (hereinafter referred to as UE); Responding to the UE via a message (2); And if the message 3 is not successfully received within a particular persistent or scheduled resource, determining, by the UE, whether to reuse the dedicated preamble for the next random access attempt.

According to the claimed invention, a method of handling a random access procedure in a user equipment (hereinafter referred to as a UE) of a wireless communication system, wherein the UE is assigned a dedicated preamble for the random access procedure, the method comprising: Outputting a dedicated preamble for the access of the random access channel for; Receiving a response from the network in a message (2); And determining whether to reuse the dedicated preamble or whether the response is received according to a response from the network.

According to the claimed invention, a method of handling a random access procedure in a network of a wireless communication system comprises: receiving a message (3) from user equipment (hereinafter referred to as UE); Outputting an acknowledgment to reply to the reception status of the message (3); Determining, according to a standardized rule or configuration, whether the dedicated preamble of the UE can be reused or released.

According to the claimed invention, a method of handling a random access procedure in a user equipment (hereinafter referred to as a UE) of a wireless communication system includes: using a dedicated preamble for a first random access procedure; And reusing the dedicated preamble for a second random access procedure subsequent to the first random access procedure according to a standardized rule or configuration.

According to the claimed invention, a method of handling a random access procedure in a network of a wireless communication system includes: assigning a dedicated preamble to user equipment (hereinafter referred to as UE) for the random access procedure; And determining whether to reuse the dedicated preamble for another access or other random access procedure of a random access channel according to a standardized rule or configuration.

According to the claimed invention, a method of handling a random access procedure in a user equipment (hereinafter referred to as a UE) of a wireless communication system, wherein the UE is assigned a dedicated preamble for the random access procedure, the method comprising: an upper layer And using the dedicated preamble within an access of a random access channel, in accordance with the configuration indicated by the control message from.

According to the claimed invention, a method for handling a random access procedure in a network of a wireless communication system includes a downlink message, or signaling, if the random access procedure is triggered, confirmed, or scheduled by the network. ), Or assigning a dedicated preamble to the user equipment (hereinafter referred to as UE) for access of the random access channel via the indication or information field.

According to the claimed invention, a method of handling a random access procedure in a network of a wireless communication system allows for coexistence of a dedicated preamble and a random access preamble corresponding to user equipment (hereinafter referred to as UE) in accordance with standardized rules or configurations. Steps.

According to the claimed invention, a method of handling a random access procedure in a user equipment (hereinafter referred to as a UE) of a wireless communication system allows coexistence of a dedicated preamble and a random access preamble for the UE for at least two random access procedures. It includes a step.

According to the claimed invention, a communication device for accurately handling a random access procedure in a wireless communication system includes: control circuitry for implementing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And a memory installed in the control circuit and coupled to the processor for storing the program code, the program code including a communication device assigned a dedicated preamble for the random access procedure; If the UE does not successfully receive a downlink message or the random access procedure fails, determine whether to reuse the dedicated preamble.

According to the claimed invention, a communication device for accurately handling a random access procedure in a wireless communication system includes: control circuitry for implementing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And a memory installed in the control circuit and coupled to the processor for storing the program code, the program code receiving a dedicated preamble for access of a random access channel from user equipment (hereinafter referred to as UE). Making; Responding to the UE via a message (2); If the message 3 does not successfully receive within a particular persistent or scheduled resource, determining whether to reuse the dedicated preamble for the next random access attempt.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code includes a communication element assigned to a dedicated preamble for the random access procedure, outputs a dedicated preamble for access of a random access channel to a network, receives a response from the network in message 2, and responds from the network. And determining whether to reuse the dedicated preamble or receive a response again.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code receives message 3 from a user equipment (hereinafter referred to as UE), outputs an acknowledgment in response to the reception status of message 3, and the dedicated preamble of the UE according to a standardized rule or configuration. Determining whether the dedicated preamble is to be reused or released according to a response from the network.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code includes using a dedicated preamble for a first random access procedure and reusing the dedicated preamble for a second random access procedure later than the first render access procedure according to a standardized rule or configuration.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code allocates a dedicated preamble for the user equipment (hereinafter referred to as UE), the dedicated preamble being reused for another access of which random access channel according to standardized rules or configurations or another random access. This includes determining whether to reuse the procedure.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code includes a communication element assigned to a dedicated preamble for the random access procedure and includes using the dedicated preamble in access of a random access channel according to the configuration indicated by the control message from a higher layer.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code is used to access a random access channel via a downlink, signal, indication, or information field when the random access procedure is triggered, confirmed, or expected by a network. Assigning a dedicated preamble for (hereinafter referred to as UE).

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code includes allowing coexistence of a dedicated preamble and a random access preamble in response to user equipment (hereinafter referred to as UE) in accordance with standardized rules or configurations.

According to the claimed invention, a communication element for accurately handling a random access procedure in a wireless communication system comprises: control circuitry for implementing the communication element function; And a processor installed in the control circuit and configured to execute program code for instructing the control circuit, and a memory installed in the control circuit and coupled to the processor for storing the program code.

The program code includes allowing coexistence of a dedicated preamble and a random access preamble for the user equipment (hereinafter referred to as UE) for at least two random access procedures.

By providing an efficient method for handling a random access procedure within a user equipment (UE) of a wireless communication system, the UE is assigned a dedicated preamble for the random access procedure, which prevents the UE from successfully receiving a downlink message. When not, or when the random access procedure fails, it is decided whether or not to reuse the dedicated preamble.

Referring to FIG. 12, which illustrates a conceptual diagram of a wireless communication system 1200, the wireless communication system 1200 is preferably an LTE system, and may include one network and a plurality of UEs. As shown in FIG. 12, the network and the UEs are used concisely to represent the structure of the wireless communication system 1200.

In practice, the network terminal comprises a plurality of base stations (or Node Bs), radio network controllers, according to actual needs, and the UEs such as mobile phones, computer systems and the like. Referring to FIG. 1, which shows a block diagram illustrating the functionality of a wireless communication device 100, the communication device 100 may be used to perform the network and the UE shown in FIG. 12.

For simplicity, FIG. 1 shows one input device 102, one output device 104, one control circuit 106, one central processing unit (CPU) 108, and one Only the memory 110, one program code 112, and the transceiver 114 of the communication device 100 are shown. In the communication device 100, the control circuit 106 executes the program code 112 in the memory 110 via the CPU 108. Thereby, the operation of the communication device 100 can be controlled. The communication device 100 may receive a signal input by a user through the input device 102 such as a keyboard, and output images and sound through the output device 104 such as a monitor and a speaker. Can be. The transceiver 114 is used to receive and send wireless signals, to transmit the received signals to the control circuit 106, and to wirelessly output the signals generated by the control circuit 106. In view of the communication protocol architecture, the transceiver 114 may be viewed as part of the first layer (Layer 1), and the control circuit 106 may be formed of the second layer (Layer 2) and the third layer (Layer 3) Can be used to realize functionality. Preferably, the communication device 100 is used in a third generation mobile communication system.

In addition, referring to FIG. 2 illustrating the program code 112 of FIG. 1, the program code 112 includes a non-access system (NAS) 200, a third layer 202, and a second. It includes a layer (Layer 2) 206, and corresponds to the first layer (Layer 1) (218).

The NAS 200 generates a NAS message for realizing a NAS application. The layer 3 202 is configured to include one RRC layer for radio resource control. The second layer 206 performs link control, and the first layer 218 performs physical coupling. Whether the PDCP layer belongs to the second layer 202 or the second layer 206 is irrelevant to the present invention. In order to achieve timing alignment and resource requests, the RACH is configured in the communication device 100 for a random access procedure. In this situation, embodiments of the present invention provide RA processing program code 220 for handling random access procedures to avoid problems of the prior art. In the following, the definitions of the messages 1,2,3,4 are the same as described above. That is, message 1 corresponds to the "Random Access Preamble on RACH in uplink" step, message 2 corresponds to the "Random Access Response on DL-SCH" step, and message 3 corresponds to the "first planned on UL-SCH" message. UL delivery "step, and message 4 corresponds to the" Contention Resolution on DL-SCH "step.

See Figure 3, which shows a schematic diagram of a process 30 according to an embodiment of the present invention. The process 30 is utilized to handle the random access procedure at the UE of the radio communication system that can respond to the RA processing program code 220. The process 30 includes the following steps:

Step 300; start

Step 302; Determine whether to reuse the dedicated preamble when the UE cannot successfully receive a downlink message or when the random access procedure fails

Step 304; End

According to process 30, an embodiment of the present invention determines whether to reuse the dedicated preamble when the UE cannot successfully receive a downlink message or when the random access procedure fails.

Preferably, when the user equipment (UE) does not successfully receive a downlink message or a random access procedure fails, a decision as to whether to reuse a dedicated preamble ( deciding is a determination as to whether to reuse a dedicated preamble when a downlink message is not successfully received after an uplink message is sent. The uplink message corresponds to message 1 corresponding to step "Random access to random access preamble on RACH (Random Access Channel) on uplink" or step "uplink shared channel". Corresponds to message 3, which corresponds to " Fist scheduled Uplink transmission " When a user equipment (UE) does not successfully receive a downlink message or a random access procedure fails, the decision about whether to reuse the dedicated preamble is a matter of reusing the dedicated preamble or asking for another dedicated preamble. Or releasing a dedicated preamble and using a random access preamble according to standardized rules or configurations.

Therefore, through process 30, the present embodiment determines whether to reuse the determined preamble when the user equipment UE has not successfully received the downlink message or the random access procedure has failed.

See FIG. 4, which shows a schematic diagram of a process 40 according to an embodiment of the invention. The process 40 is used to handle random access procedures in the network of the wireless communication system 1200 and can be followed through the RA processing program code 220. The process 40 consists of the following steps.

Step 400: Start.

Step 402: Receive a dedicated preamble for access of a random access channel from a user equipment (UE).

Step 404: Respond to the user equipment (UE) via message 2.

Step 406: When message 3 is not successfully received within a specific specified duration or scheduling resource, the next random access attempt determines whether the user equipment (UE) reuses the dedicated preamble.

Step 408: End.

According to process 40, after the network has received a dedicated preamble for access of the random access channel through the user equipment (UE), the network responds to the user equipment (UE) via message 2, and within a specific due date or scheduling resource. When message 3 is not successfully received, the next random access attempt determines whether the user equipment (UE) reuses the dedicated preamble.

Preferably, message 3 within a particular due date or schedule resource is not received, received, or detected but not received when message 3 is not detected. When the user equipment UE for the next random access attempt determines whether to reuse the dedicated preamble, an embodiment of the present invention may withdraw the assignment of the dedicated preamble to the user equipment UE according to standardized rules or configurations. Or may allow the user equipment (UE) to reuse the dedicated preamble according to standardized rules or configurations, or may assign another dedicated preamble.

Therefore, via process 40, after the network has received the determined preamble for access of the random access channel from the user equipment (UE), the network responds to the user equipment (UE) via message 2, and message 3 has a specific duration or The UE determines whether to reuse the determined preamble for the next random access attempt when it is not successfully received in the scheduling resource.

See FIG. 5, which shows a schematic diagram of a process 50 according to an embodiment of the invention. The process 50 is used to handle the random access procedure at the user equipment (UE) of the wireless communication system 1200 and can be translated into the RA processing program code 220. The process 50 consists of the following steps.

Step 500: Start.

Step 502: Output the determined preamble for access of the random access channel to the network.

Step 504: Receive a response from the network to message 2.

Step 506: Determine whether to reuse the determined preamble according to the response from the network or whether the response is received.

Step 508: End.

According to procedure 50, after the UE outputs a dedicated preamble for access to a network of a random access channel, the UE receives a response from the network in message 2, and then the UE is sent from the network. According to the response, it is determined whether to reuse the dedicated preamble or whether to receive the response.

 Advantageously, if the network does not successfully receive the message 3 and considers or attempts a next random access attempt, an embodiment of the present invention may request another dedicated preamble or Wait for allocation of the dedicated preamble or release the dedicated preamble according to standard rules or configurations.

Accordingly, in step 50, the UE determines whether to reuse the dedicated preamble or receive the response according to the response from the network.

Referring to FIG. 6, FIG. 6 is a schematic diagram of a process 60 according to an embodiment of the present invention. Process 60 is used to handle random access procedures in the network of the wireless communication system 1200 and can be compiled into the RA processing program code 220. The process 60 includes the following steps.

Step 600: Start.

Step 602: Receive message 3 from the UE.

Step 604: Output acknowledgment for responding to the reception status of message 3.

Step 606: Determine whether the dedicated preamble of the UE is to be reused or emitted according to a standardized rule or configuration.

Step 608: End.

According to procedure 60, after the network receives message 3 from the UE, the network outputs an acknowledgment to respond to the reception status of message 3 and reuses the UE's dedicated preamble according to a standardized rule or configuration. Determine whether it will be released or released.

Advantageously, said standardized rule or arrangement rules procedures, rules, handling methods, and decisions under certain conditions. The procedures, rules, handling method, and determination under certain conditions may include determining whether the transmitted message 4 corresponding to the conflict resolution step is a response to the message 3, or if the UE is configured for another random access procedure. Whether to include another access of another random access channel, whether to release or withdraw the allocation of the dedicated preamble or to allow reuse of the dedicated preamble after message 4 responds to message 3; Determining whether corresponding message 4 has been successfully transmitted or retransmitted, or whether access of another random access channel requires the use of the dedicated preamble.

Thus, after the network has received message 3 from the UE via process 60, the network outputs an acknowledgment to respond to the reception status of message 3 and the dedicated preamble of the UE is subject to standardized rules or configurations. Accordingly determine whether it can be reused or released.

Referring to FIG. 7, FIG. 7 is a schematic diagram of a process 70 according to an embodiment of the present invention. The process 70 is used to handle random access procedures at the UE of the wireless communication system 1200 and can be compiled into the RA processing program code 220. The process 70 includes the following steps.

Step 700: Start.

Step 702: Use the dedicated preamble for the first random access procedure.

Step 704: Reuse the dedicated preamble for a second random access procedure that occurs later than the first random access procedure according to a standardized rule or configuration.

Step 706: End.

According to process 70, after the UE uses the dedicated preamble for the first random access procedure, an embodiment of the present invention may generate a second random access that occurs later than the first random access procedure according to a standardized rule or configuration. The dedicated preamble can also be reused for the procedure.

Advantageously, said first random access procedure is a synchronization request or handover procedure, while a second random access procedure is a scheduling request, handover, synchronization request, radio link failure recovery, or reuse of said dedicated preamble with respect to said dedicated preamble. This is a process of indicating a network for allocating a preamble. The standardized rule or construct rules the procedures, rules, handling methods, and decisions under certain conditions. The procedures, rules, handling method, and determination under certain conditions may determine whether the first and second random access procedures are separated from each other within a certain time interval, or whether permission of a resource for the first random access procedure is determined. Determining whether it is sufficient for the second random access procedure, whether a need for a dedicated preamble is caused by another access to a higher priority random access channel, and the like. The second random access procedure requires the use of a dedicated preamble. Detection / initiation of the second random access procedure occurs during or after the first random access procedure.

Therefore, after the process 70, after the UE uses the dedicated preamble for the first random access procedure, an embodiment of the present invention provides for the second random access procedure according to a standardized rule or configuration after the first random access procedure. The dedicated preamble can be reused.

Reference is made to Figure 8, which is a schematic diagram of a process 80 in accordance with an embodiment of the present invention. The process 80 is used to handle random access procedures in the network of the wireless communication system 1200, which can be compiled into the RA processing code 220. Process 80 includes the following steps.

Step 800: Start

Step 802: Dedicated Preamble Allocation for UE for Random Access Procedure

Step 804: Determine whether the dedicated preamble can be reused for another access or other random access procedure of the random access channel according to standardized rules or configurations.

Step 806: Exit

According to process 80, after assigning a dedicated preamble for a UE for a random access procedure, the network can determine whether the dedicated preamble can be reused for another access or other random access procedure of the random access channel according to standardized rules or configurations. Determine whether or not.

Advantageously, embodiments of the present invention may indicate to the UE whether to reuse the dedicated preamble when access of another random access channel is foreseen, initiated, confirmed, or when access of another random access procedure occurs. Access of another random access channel is triggered by a synchronization procedure according to a network initialization or handover procedure. Indicating whether to reuse the dedicated preamble to the UE includes indicating to reuse the dedicated preamble, and instructing the UE to release the dedicated preamble or to use a new dedicated preamble or random access preamble.

Therefore, after assigning a dedicated preamble for the UE for the random access procedure via process 80, the network may be reused for another access or other random access procedure of the random access channel according to the rules or configuration for which the dedicated preamble is standardized. Determine whether you can.

Reference is made to Figure 9, which is a schematic diagram of a process 90 in accordance with an embodiment of the present invention. Process 90 is used to handle random access procedures in the network of wireless communication system 1200, which may be compiled into RA processing code 220. Process 90 includes the following steps.

Step 900: Start

Step 902: Dedicated preamble allocation for the UE for access of the random access channel via downlink message, signaling, indication or information field when the random access procedure is triggered, confirmed or predicted by the network

Step 904: Exit

According to process 90, an embodiment of the present invention provides a UE for access of a random access channel via a downlink message, signaling, indication or information field when a random access procedure is triggered, confirmed or predicted by the network. Allocate a dedicated preamble for.

Preferably, the random access procedure is a synchronization according to a call or handover access occurring in the network. The downlink message or signaling is an RRC, MAC, or NAS message or signaling. The initial message or signaling corresponds to a control message or signal of a handover procedure or a call originating from the network. The indication or information field may be a flag for indicating that a dedicated preamble has been allocated, an index for indicating which dedicated preamble is used in the pool, and / or a preamble field for indicating which dedicated preamble.

Therefore, through process 90, an embodiment of the present invention enables access of a random access channel via a downlink message, signaling, indication or information field when a random access procedure is triggered, confirmed, or anticipated by the network. Allocates a dedicated preamble for the UE.

  Reference is made to Figure 10, which is a schematic diagram of a process 1000 in accordance with an embodiment of the present invention. Process 1000 is used to handle random access procedures within a network of wireless communication system 1200, which may be compiled into RA processing code 220. Process 1000 includes the following steps.

Step 1002: Start

Step 1004: Allow coexistence of a dedicated preamble and a random access preamble corresponding to the UE according to a standardized rule or configuration

Step 1006: Exit

In accordance with procedure 1000, the network allows coexistence of a dedicated preamble and a random access preamble corresponding to the UE according to standardized rules or configurations.

Therefore, via process 1000, the network may allow coexistence of dedicated preambles and random access preambles corresponding to the UEs according to standardized rules or configurations.

See FIG. 11. 11 shows a schematic diagram of a process 1100 in accordance with an embodiment of the present invention. Process 1100 is utilized to handle random access procedures at the UE of the wireless communication system 1200 and can be compiled into RA processing program code 220. Process 1100 includes the following steps.

Step 1102: Start

Step 1104: Allow coexistence of a dedicated preamble and a random access preamble for the UE for at least two random access procedures

Step 1106: Finish

According to process 1100, the UE allows coexistence of a dedicated preamble and a random access preamble for the UE for at least two random access procedures.

Preferably, the UE can determine which preamble should be used for an individual procedure according to the access cause, priority, QoS of the procedures, or which procedure maintains a dedicated preamble for less time. The time of the dedicated preamble maintained by the first random access procedure is shorter.

Therefore, via process 1100, the UE allows coexistence of a dedicated preamble and a random access preamble for the UE for at least two random access procedures.

In summary, embodiments of the present invention provide different operations of a random access procedure to perform timing alignment and resource requests.

Those skilled in the art will readily appreciate that many variations and modifications of the apparatus and methods may be made while retaining the teachings of the present invention. Accordingly, the above disclosure should be construed as limited only by the boundaries and the scope of the appended claims.

1 is a block diagram showing the function of a wireless communication device 100 according to the present invention.

2 shows program code 112 of FIG.

3 to 11 are schematic views of a process according to an embodiment of the present invention.

12 is a conceptual diagram of a wireless communication system according to the present invention.

Claims (48)

1. A method for handling a random access procedure in user equipment (hereinafter “UE”) of a wireless communication system, The UE is assigned a dedicated preamble for the random access procedure, The method, Determining whether to reuse the dedicated preamble when the UE does not successfully receive a downlink message or when the random access procedure fails. The method of claim 1, The downlink message may be a message 2 corresponding to the "random access response in DL-SCH" message, a message 4 corresponding to the "collision resolution in DL-SCH" step, or a first scheduled uplink in the uplink shared channel. The response of message 3 corresponding to the "send" step. The method of claim 1, Determining whether to reuse the dedicated preamble when the UE does not successfully receive a downlink message or when the random access procedure fails; Determining whether to reuse the dedicated preamble when the downlink message is not successfully received after an uplink message is sent. The method of claim 1, The uplink message corresponds to message 1 corresponding to the "random access preamble at RACH on uplink" step, or message 3 corresponding to the "scheduled first uplink transmission on uplink shared channel" step. Characterized in that. The method of claim 1, Determining whether to reuse the dedicated preamble when the UE does not successfully receive a downlink message or when the random access procedure fails; Reusing the dedicated preamble or requesting another dedicated preamble, waiting for allocation of another dedicated preamble, releasing the dedicated preamble or using a random access preamble according to a standardized rule or configuration Characterized in that the method. A method for handling a random access procedure in a network of a wireless communication system, Receiving a preamble dedicated for access of a random access channel from user equipment; Responding to the UE via message 2; And When message 3 is not successfully received within a particular interval or scheduling resource, the UE determining whether to reuse the dedicated preamble for the next random access attempt; Method comprising a. 7. The message of claim 6, wherein the message 3 is not received when the message 3 is not found or not received, or when found but not received within a specified duration or scheduling resource. How to. 7. The method of claim 6, wherein message 3 corresponds to the " first scheduled uplink transmission on an uplink shared channel " step. 7. The method of claim 6, wherein the method determines a dedicated preamble assigned to the UE according to a standardized rule or configuration when determining whether the UE reuses the found preamble for a next random access attempt. Withdrawing, or allowing the UE to reuse the dedicated preamble according to a standardized manner or configuration, or allocating another dedicated preamble. A method of handling a random access procedure in a user equipment (UE) of a wireless communication system, The UE is a UE to which a dedicated preamble is allocated for the random access procedure. Outputting a dedicated preamble for accessing a random access channel to a network; Receiving a response from the network in message 2; And Determining whether to reuse the found preamble or whether the response is received according to a response from the network. 12. The method of claim 10, wherein message 3 corresponds to a " first scheduled uplink transmission on an uplink shared channel ". 11. The method of claim 10, wherein when the network successfully considers or attempts a next random access attempt without receiving the message 3, it requests another dedicated preamble according to a standardized rule or configuration. Or waiting for allocation of another dedicated preamble, or releasing the dedicated preamble. A method of handling a random access procedure in a network of a wireless communication system, Receiving message 3 from a user equipment (UE); Outputting an acknowledgment to reply to said receipt status of said message 3; And Determining whether the dedicated preamble of the UE can be reused or released according to a standardized rule or configuration. 15. The method of claim 13, wherein message 3 corresponds to the step " first scheduled uplink transmission on uplink shared channel. &Quot; The method of claim 13, wherein the standardized manner or configuration details decisions, procedures, rules, and handlings under certain conditions. 16. The method of claim 15, wherein the determination, procedure, method, and handling under the predetermined condition determine whether the transmitted message 4 corresponding to the resolution resolution step is the response of the message 3, Whether to include another connection of another random access channel, whether to release or withdraw the allocation of the dedicated preamble or whether to allow reuse of the dedicated preamble after message 4 responds to message 3 Determining whether message 4 corresponding to the resolution step has been successfully transmitted or retransmitted, or whether a connection of another random access channel requires the use of the dedicated preamble. A method of handling a random access procedure in a user equipment (UE) of a wireless communication system, Using a dedicated preamble for the first random access procedure; And And reusing the dedicated preamble for the second random access procedure later than the first random access procedure according to a standardized scheme or configuration. 18. The method of claim 17, wherein the first random access procedure is a synchronization request or handover procedure. 18. The method of claim 17, wherein the second random access procedure assigns the dedicated preamble with respect to the scheduling request, handover, synchronization request, radio link failure recovery, or the use of the dedicated preamble. Characterized in that the procedure for indicating the network. 18. The method of claim 17, wherein the standardized manner or setting details decisions, procedures, methods, handling under certain conditions, and whether the first and second random access procedures are separated from one another within the duration. Whether or not the grant of resources for the first random access procedure is sufficient for the second random access procedure, a preamble dedicated by another connection of a random access channel at a higher priority. Determining whether there is a need. The method of claim 17, And the second random access procedure is required to use a dedicated preamble. The method of claim 17, The detection or initiation of the second random access procedure occurs during or after the first random access procedure. A method for handling a random access procedure in a network of a wireless communication system, the method comprising: Assigning a dedicated preamble for the user equipment referred to as UE below, for the random access procedure; And Determining whether the dedicated preamble can be reused for access to another random access channel or another random access procedure according to a standardized rule or configuration. The method of claim 23, wherein Indicating to the UE whether to reuse the dedicated preamble when an access of another random access channel is scheduled, started, approved, or when access of another random access procedure occurs. . The method of claim 24, Access of the other random access channel is triggered by a synchronization procedure or a handover procedure due to network initiation. The method of claim 24, The step of indicating whether the UE reuses the dedicated preamble includes whether the UE reuses the dedicated preamble, whether to release the dedicated preamble, or whether a new dedicated preamble or random access preamble is generated. And indicating whether or not to use. A method for handling a random access procedure at a user equipment, referred to as UE, below in a wireless communication system, UE is assigned a dedicated preamble for the random access procedure, the method, Using the dedicated preamble in access of a random access channel according to the configuration indicated by the control message from a higher layer. The method of claim 27, The upper layer indicates at least one lower layer using the dedicated preamble according to the configuration indicated by the control message. The method of claim 27 The configuration indicated by the control message is carried in a signaling or assignment signal of the dedicated preamble. As a method for handling a random access procedure in a network of a wireless communication system, the method includes: Dedicated preamble for the user equipment, referred to as UE below, for access of the random access channel via downlink message or signaling, or indication or information field when the random access procedure is triggered, approved, or scheduled by the network Assigning a method. The method of claim 30, Wherein the random access procedure is synchronization due to a call or handover access of network origin. The method of claim 30, The downlink message or signaling is an RRC, MAC, or NAS message or signaling. The method of claim 30, The initiation message or signaling corresponds to a control message or signal of a handover procedure or to a call of network origin. The method of claim 30, The indication or information field may be a flag indicating that a dedicated preamble allocation exists, an index indicating which dedicated preamble is used in the pool, and / or a preamble indicating which dedicated preamble is used. Method, which is a field. A method of handling a random access procedure in a network of a wireless communication system, the method comprising: Allowing for the coexistence of a dedicated preamble and a random access preamble corresponding to a user equipment referred to as a UE according to a standardized rule or configuration. A method for handling a random access procedure at a user equipment, referred to as UE, below, of a wireless communication system, the method comprising: Allowing coexistence of a random access preamble and a dedicated preamble for the UE for at least two random access procedures. The method of claim 36, Determining which preamble is used for the individual procedure according to the QoS, priority, and cause of access of the procedures, and which procedure maintains the dedicated preamble for less time. The method of claim 37, And the time of the dedicated preamble maintained by the first random access is shorter. A communication apparatus for accurately processing a random access procedure in a wireless communication system, Control circuitry for realizing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And A memory installed in the control circuit and coupled to the processor for storing the program code; The program code is, The communication device being assigned a dedicated preamble for the random access procedure; And Determining whether to use the dedicated preamble again when the UE has not successfully received a downlink message or whether the random access procedure has failed. A communication apparatus for accurately processing a random access procedure in a wireless communication system, Control circuitry for realizing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And A memory installed in the control circuit and coupled to the processor for storing the program code, The program code is, Receiving a dedicated preamble for access of a random access channel from a user equipment (hereinafter UE); Responding to the UE via message 2; And When message 3 has not been successfully received within a particular interval or scheduling resource, determining whether the UE should reuse the dedicated preamble for a next random access attempt. A communication apparatus for accurately processing a random access procedure in a wireless communication system, Control circuitry for realizing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And A memory installed in the control circuit and coupled to the processor for storing the program code, The program code is, The communication device being allocated a dedicated preamble for the random access procedure; Outputting a dedicated preamble for access of the random access channel to the network; Receiving a response from the network in message 2; And Determining whether to reuse the dedicated preamble or whether the response has been received in response to a response from the network. A communication apparatus for accurately processing a random access procedure in a wireless communication system, Control circuitry for realizing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And A memory installed in the control circuit and coupled to the processor for storing the program code, The program code is, Receiving message 3 from a user equipment (hereinafter UE); Outputting a confirmation to respond to the reception status of message 3; And Determining whether the dedicated preamble of the UE can be reused or released in accordance with standardized rules or configurations. A communication apparatus for accurately processing a random access procedure in a wireless communication system, Control circuitry for realizing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And A memory installed in the control circuit and coupled to the processor for storing the program code, The program code is, Using a dedicated preamble for the first random access procedure; And And reusing the dedicated preamble for a second random access procedure after the first random access procedure according to a standardized rule or configuration. A communication apparatus for accurately processing a random access procedure in a wireless communication system, Control circuitry for realizing the functions of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And A memory installed in the control circuit and coupled to the processor for storing the program code, The program code is, Allocating a dedicated preamble for user equipment (hereinafter UE) for the random access procedure; And Determining whether the dedicated preamble can be reused for another access or other random access procedure of a random access channel in accordance with standardized rules or configurations. A communication device for accurately processing a random access procedure in a wireless communication system, Control circuitry for executing a function of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And And a memory installed in the control circuit and connected to the processor for storing the program code. The program code is Assigning a dedicated preamble to the communication device for a random access procedure; And Using a dedicated preamble within the access of the random access channel in accordance with the configuration indicated by the control message from the higher layer. A communication device for accurately processing a random access procedure in a wireless communication system, Control circuitry for executing a function of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And And a memory installed in the control circuit and connected to the processor for storing the program code. The program code is Assigning, for the user equipment, a dedicated preamble for access to the random access channel via a downlink message or signaling or indicator or information field when a random access procedure is triggered or confirmed or scheduled by the network; Including, a communication device. A communication device for accurately processing a random access procedure in a wireless communication system, Control circuitry for executing a function of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And And a memory installed in the control circuit and connected to the processor for storing the program code. The program code is Allowing coexistence of the dedicated preamble and the random access preamble corresponding to the user equipment according to standardized rules or configurations. A communication device for accurately processing a random access procedure in a wireless communication system, Control circuitry for executing a function of the communication device; A processor installed in the control circuit to execute program code for instructing the control circuit; And And a memory installed in the control circuit and connected to the processor for storing the program code. The program code is Allowing coexistence of a dedicated preamble and a random access preamble corresponding to the UE for at least two random access procedures.

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